CSPROJ updates. Altered some of the ToolsVersion to 12, and removed the VisualStudioVersion node which causes problems in later versions of VS/Msbuild
Added in a CI Status icon for the Model Server branch

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C36197